Fenix 6 Pro: counting steps when Not moving

Hallo,

I have the following Problem with my Fenix 6 pro: I am sitting in my living room and do Not even move my Arms/hands and my Watch is counting steps as I can See in Garmin Connect on my iPhone. A restart of my Fenix did not Solve the Problem. Dies anybody Else have this behaviour? Andy Ideas how to solve the Problem?